TM 9-4120-408-14
4-23. THERMOSTAT MAINTENANCE
This task covers:
Remove
Inspect
Test
Install
INITIAL SETUP:
Tools
Equipment Conditions
Tool Kit, Service Refrigeration Unit,
Air Conditioner shut down,
Material/Parts
Power disconnected, refer to applicable
technical manual.
Conductive RTV Silicone Caulking,
Appendix E, Item 8
Control Module Top Panel removed,
RFI Rotary Shaft Seal Boot, Appendix G,
Item 5
General Safety Instructions
Lock Washers, Appendix G, Item 11
Do not work on equipment without
(Thermostat)
following standard shop safety
procedures.
Lock Washers, Appendix G, Item 14
(Clamps)
WARNING
Refer t6 TM 9-4120-408-24P for part
numbers of items to be replaced.
Do not work on equipment with power
connected. Electrocution hazard is
present. Failure to obey this warning
may result in death or serious personal
injury.
a. Remove.
(1) Loosen two set screws (Figure 4-17, 1) and remove knob (2).
(2) Remove two screws (3), lock washers (4), flat washers (5), and cushion clamps (6). Remove thermostat sensing
bulb (7) from cushion clamps (6). Discard lock washers (4).
CAUTION
Use care when removing conductive RTV silicone caulking from tube in control module housing. Damage
to thermostat sensor capillary tube may result.
(3) Remove conductive RTV silicone caulking from tube (8) in control module housing (9).
(4) Remove and discard RFI rotary shaft seal boot (10).
CAUTION
Use care when removing thermostat sensor from control module housing. Damage to thermostat capillary
tube and sensor may result.
(5) Remove two screws (11), thermostat (12), and thermostat bracket (13).
(6) Remove EMI shaft seal locking nut (14).
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